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Effect of high temperatures on high performance steel fibre reinforced concrete

Lau, A. ; Anson, M.

Cement and concrete research, 2006-09, Vol.36 (9), p.1698-1707 [Periódico revisado por pares]

New York, NY: Elsevier Ltd

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  • Título:
    Effect of high temperatures on high performance steel fibre reinforced concrete
  • Autor: Lau, A. ; Anson, M.
  • Assuntos: Applied sciences ; Buildings. Public works ; Concretes. Mortars. Grouts ; Exact sciences and technology ; Fibre reinforced concrete (including asbestos cement) ; High performance concrete ; High temperature ; Materials ; Mechanical properties ; Other special applications (sand concrete, roller compacted concrete, heavy concrete, architectural concrete, etc.) ; Saturation level ; Steel fibre reinforced concrete
  • É parte de: Cement and concrete research, 2006-09, Vol.36 (9), p.1698-1707
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: After being subjected to different elevated heating temperatures, ranging between 105 °C and 1200 °C, the compressive strength, flexural strength, elastic modulus and porosity of concrete reinforced with 1% steel fibre (SFRC) and changes of colour to the heated concrete have been investigated. The results show a loss of concrete strength with increased maximum heating temperature and with increased initial saturation percentage before firing. For maximum exposure temperatures below 400 °C, the loss in compressive strength was relatively small. Significant further reductions in compressive strength are observed, as maximum temperature increases, for all concretes heated to temperatures exceeding 400 °C. High performance concretes (HPC) start to suffer a greater compressive strength loss than normal strength concrete (NSC) at maximum exposure temperatures of 600 °C. It is suggested that HPC suffers both chemical decomposition and pore-structure coarsening of the hardened cement paste when C–S–H starts to decompose at this high temperature. Strengths for all mixes reached minimum values at 1000 or 1100 °C. No evidence of spalling was encountered. When steel fibres are incorporated, at 1%, an improvement of fire resistance and crack [F.M. Lea, Cement research: retrospect and prospect. Proc. 4th Int. Symp. On the Chemistry of Cement, pp. 5–8 (Washington, DC, 1960).] resistance as characterized by the residual strengths were observed. Mechanical strength results indicated that SFRC performs better than non-SFRC for maximum exposure temperatures below 1000 °C, even though the residual strength was very low for all mixes at this high temperature. The variations with colour, which occured, are associated with maximum temperatures of exposure.
  • Editor: New York, NY: Elsevier Ltd
  • Idioma: Inglês
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